Key-pulling tool



March 9 1926.

M. c. DEIFENDERFER KEY PULL NG 'EGOL- 2 Sheets-Sheet 1 Filed Jan. 23

L L m A INVEN'TQR Mt/RV//V C. DE/FHVERFER.

March 9 1926.

M. C. DEIFENDERFER KEY PULLING TOOL Filed Jan.

25, 1925 2 sheets-sheet 2 ukwN ATTOR NEYS Patented Mar. 9, 1926.

UNITED STATES PArENr OFFICE;

MURVIN C. DEIFQENDERFER, OFBLUFFTON, OHIO, ASSIGNOR TO SCOTT & EW'INGCOM- i IPANY, A PARTNERSHIP COMPOSED OF FRANK SCOTTAND E. EWING, BOTH OFBLUFFTON, oHIo.

KEY-PULLING TOOL.

Application filed January 23, 1925. Serial No. 4,173..

To all whom t may concern:

Be it known that I, MURVIN C( DEIFEN- DERFER, a citizen of the UnitedStates, re-A siding at Bluffton, in the county of Allen and State ofOhio, have invented lcertain new and useful Improvements in Key-PullingTools, of which the following is a specification, reference being hadtherein to the accompanying drawing. j y

My invention relates to key pullers.

It is the object 0f my invention -to provide a key puller which willgrip the key with increasing force as the pull on the key is increased.y

It ,is a further object'of my invention to provide a key puller which isadjustable to `different-sizes of keys and which is adapted tohavedifferent sizes and types fof key gripping surfacessubstituted in themaster key 20 pulling` tool.

It is a further object of my invention to provide a tool which isadaptable for use on either a short shaft without the tool tilting or along line shaft.

It is a further object of my invention to provide a tool having meansfor carrying the anti-tipping means of the tool when used with shortshafts in a predetermined relationship with the rest of the tool despite30 the movement Vof the tool with respect to the short shaft. j

It is a further obj ect to provide means for moving the key pulleras awhole with the key relative to the shaft, means for adjusting theinitialgrip onthe key, and means for adjusting thev anti-tipping deviceassociated with the key pulling tool. j

It is a further object of my invention to provide a very rigid andsturdy tool of 10 simple construction which, even though the parts maywear, will not effect its operation as it is so adjustable as tocompensate for wear.

Referring to the drawings:

Figure 1 is a plan view of the tool with the anti-tipping device inposition and a4 key in the clamping jaws of the tool;

Figure 2 is an end elevation of thetool from the key end;

Figure 3 is an end yelevation of the tool viewed from the end on whichthe screws are actuated;

device;

Figure 4 isa section through the tool showing the tool applied to ashort shaft and in the process of extracting akey from said shaft;

Figure 5 is-a side elevation of the tool without. the anti-tippingdevice mounted on a long shaft such as a line shaft inthe proc-v essofextracting a key; y

Figure 6 is an end elevation from the actuating end with the shaft insection and the key in section showing the location-and position of thetool without the anti-tipping `Figure 7 is a section onthe line7-7 ofFigure 1.; j Y

Figure 8 kis a section on the line 8 8 4of Figure 1; f

Figure 9 is a plan view of apair of the detachable clampingjaws showinga somewhat different form of jaws which are adaptable fory sucha tool..y

Turningto the drawings and describing them in detail, 1 is a base 4blockwhich carries the master actuating screw 2 which serves yto move theentire tool relative to the shaft, thus extracting the key from theshaft as the key travels withthe tool when suitably clamped Aashereinafter' described. ,This shaft 2 is threaded in a threaded portion3 on ythe base block 1. It turns freely in and is spaced from-the baseblock 1 due to the enlarged apertures l and 5 on either side of thethreaded portion 3 of the base block 1. The actuating end of this screwis squared at its edges to receive a suitable handle or crank or otheragency for rotating the screw 6. The other end of the screw is providedwith a head 7 havingan annular kdepression 8. On this head is mounted racup-shaped member 9 having a roughened face 10 lfor engaging with thehub or other portion of a member mounted on the shaft` with the key.This cup-shaped. `detachable head is maintained in position on thehead'7 of the screw by a set screw 11 which passes through the member 9intothe annular groove 8 of the`head-7. 'j This base block is provided'on either `side with upwardly extending shoulders 12 which have spacedoverhanging ledgesl 13.` Such spaced overhanging ledgesnor shouldersmaytion of the tool hasits outside faces 1T and 18 also tapering andconverging` towards the face 16. The faces 15 with the convergingover-hanging ledges 13 and shoulders 12 form converging guide ways forthe sliding triangular shaped blocks 19 which carry the clamping aws 20.These blocks are provided with stems 21, the central axis of which isparallel with the outer diagonal face 22 of the block 19, which facerides against the tapering face 15 which guides it inwardly as the blockproceeds outwardly. This stem 21 projects through a diagonally arrangedaperture 23 formed in the head 24 which is mounted upon the baseblock 1. This head 24 is held in position by similar countersunk screwsas those marked 14.

I prefer to make this head 24 integral with the overhanging shouldersand ledges so that a U-shaped member is thus formed which is mounted onthe base block 1. This Ushaped member has shouldered arms 12whichconverge towards one another. j j

It will be obvious that the sliding blocks 19 will thusbe guided so thatas they move inwardly and outwardly with their inner `faces 25 parallelto the ,major axis ofthe V tool, such faces 25 will be approaching suchmajor axis and approaching one another. Thus the clamping jaws 2O whichhave the roughened surfaces .26 will be forced in tighter and tighterengagement with the key 2,7 as the jaws change their position relativelyto the base block 1 `to the guiding shoulders 1.2. These jaws are heldin position in the sliding blocks hy shoulders 28 tting in grooves 29 inthe blocks. These blocks are detachable. Their sid-es rest upon the topof the base block. Various forms of these clampingjaws may be employed.A m'o'difiedform is shown in Figure 9.

ItV will thus be seen that the complete tool is a relatively simple oneconsisting of a base block, the unitary guiding shoulders, a head blockU-shaped in general form, the sliding blocks, the clamping jaws,and themainactuating screw. .j

In order to form a convenient method'of adjusting the sliding blocks andthe clamping jaws to a key of pre-determined size in order to providemeans of adjusting the jaws quickly to the key, I provide an adjustingscrew 30. This screw has a squared head 31 upon which is detachablymounted asocket wrench 32 for adjusting the position of It carries onits inner end a grooved headV 34. On this grooved head is mounted acup-shaped block carrying a set screw 36 which engages "with the innerends of the clamping jaws 20. Thus it is possible to move the blocks andjaws relative to the key without moving the tool as a whole.

Incase a short shaft is being worked upon as in Figure 4, the shaftbeing designated 3S, I provide an antitipping device which :isdetachable from the tool. `Thisfanti-tipping device consists of aslidiitg` anti-tipping block 39. It is guided in upwardly and laterallyextending L-shaped guides 40 held in position by screws 41 on the headblock 24.` This head block is provided with an aperture 42 through whichis inserted` a sleeve 43 held in position in the block` by the set screw44. This sleeve is internally spaced to carry the screw 45 which isthread ed in the carrier block 39 of which the` sleeve 43 is an integralpart. This screw 45 has a squaredV head 461"L to receive the socketwrench `.52 and adjust it whileits other end is provided with a locatingpoint 47 forengagement with the end of the shaft. This carrier Vblock 39extends downwardly behind theanti-.tipping block andhase block in anarm46 and terminates in an eye-which has an aperture 48 through whichpassesthe the main screw 2 freely. In order that this j carrier blockand its mechanism may travel with the rest of the tool in predeterminedrelationship therewith so that as the Inovement of the tool takes placethe anti-tipping device will be held infirm engagement with the end ofthe shaft 8S, a pairof collars 49 and 50 areprovided which are threadedup on the main screw 2. One of these collars serves to hold the arm 4,6in this predetermined relationship, while the other collar acts as alocknut. l These eollarsare provided with apertures 51 to receive awrench if that is desired.

The clamping jaws 20 `may `befurther fixed in position on the blocksbythe'use of screw 52.

In Figure 5, I designate the long shaft such as line shafting `andthehub with the pulley r54. j l j It will be noted fin. this figure andin Figure 6 the anti-tipping device"has been removed as that is notnecessary andlwould be in the way when resting the tool upon acontinuous piece of shafting of the character disclosed. j j C j j Itwill be understood that I desire to comprehend withinlmy invention suchmodifica# tions as may be necessary to adaptit to vary ing conditions ofuse. j j j I-Iaving thus fullydescribed my invention, what I claim asnew and desire to secure by Letters Patent; is I j j 1. Ina keypulling-tool, "a haseblock, spaced converging guiding members, taperedsliding blocks `carried thereby, engaging jaws `carried by therespectiveblocks, and means carried by saidbaseblock such as a screw adapted tohave one end actuated and the other end engaging an abutment adjacentthe shaft in which the keyis located which is engaged between the jaws.

2. In a key pulling tool, a base block, spaced converging guidingmembers, tapered sliding blocks carried thereby, engaging jaws carriedby the respective blocks, means carried by said base block such as ascrew adapted to have one end actuated and the other end engaging anabutment adjacent the shaft in which the key is located which is engagedbetween the jaws, and a head block mounted on said base block, andscrews carried on said sliding blocks traveling in apertures on saidhead block to cooperate in guiding said sliding blocks.

8. In a key pulling tool, a base block, spaced converging guidingmembers, tapered sliding blocks carried thereby, engaging jaws carriedby the respect-ive blocks, means carried 'by said base block such as ascrew adapted to'have `one end actuated and the other end engaging anabutmentadjacent the shaft in which the lkey is located which is engagedbetween the jaws, a head block mounted on said base block, screwscarried on said sliding blocks traveling in apertures on said headblocky to cooperate in guiding said sliding blocks, an'dvmeans carriedby said head block for adjustably positioning said sliding blocksfandjaws in engagement with the key.

4. In a key pulling, tool, a base block, spaced converging guidingmembers, tapered sliding blocks carried thereby, engaging jaws carriedbythe respective. blocks, means carried by saidbase block such as a screwadapted tol have one end actuated and the other engagingan abutmentadjacent the shaft in whichthe key is located which is engaged betweenthe jaws, a headvblock mounted on said base block, screws carried onsaid sliding blocks traveling in apertures on said head block tocooperate in guiding said sliding blocks, means carried by said headblock for adjustably positioning said sliding blocks and jaws inengagement with the key, said means consisting of a screw turning insaid head block.

5. In a key pulling tool, a base block, a U-shaped supplementary blockconsisting of a transverse head block and arms having inwardly extendingoverhanging ledges and guiding surfaces converging towards one another`towards the outer ends of said arms, whereby a keystone space is formedbetween said block and arms, triangular shaped sliding blocks sliding onsaid inner surfaces of said arms beneath said ledges having parallelinner faces parallel with the major axis of the tool, clamping jawscarried on the respective parallel faces of the sliding blocks, guidingstems reciprocating in the head block carried by the sliding blocks,said stems being parallel with the converging faces of the arms, andamain actuating screw carried in the base block having one end adaptedtoactuate the screw and the other endto engage with an abutment on theshaft in which the key is located.

6. In a key pulling tool, a base block, a U-shaped supplementary blockconsisting of a transverse head block and arms having in"- wardlyYextending overhanging ledges and guiding vsurfaces converging towardsone another towards the outer ends of said arms, whereby a keystonespace is formed between said block and arms, triangular shaped slidingblocks sliding on said inner surfaces of said arms beneath said ledgeshaving parallel inner faces parallel with the major axis ofthe tool,clamping jaws carried on the respective parallel faces of the slidingblocks, guiding stems reciprocating inthe head block carried by thesliding blocks, said stems being parallel with the converging faces ofthe arms, and a main actuating screw carried in the base block havingone end adapted to actuate the screw and the other end' to engage withan abutmentv on the shaft in which the key is located, and a secondscrew mounted in the head block having a hub adapted to engage with theclamp'- ing jaws to position the jaws in the sliding blocks in clampingengagement with the key.

7. In, a key pulling tool, a supporting means, jaw carrying means, keyclamping jaws, said jaws and the carrying means being so arrangedthatlas they'rnove in one directionthe faces will be maintained inparallel relationship and will draw together to engage a key, amasteractuating means for moving'V the block and jaws with akey relative to'ashaft, and. a? separate setting means for initially setting the jaws andblocks in clamping engagement with the key.

8. In a key pulling tool, abase block, a U-sha-ped supplementary blockconsisting of a transverse head block and arms having inwardly extendingoverhanging ledges and guiding surfaces converging towards one anothertowards the outer ends of said arms, whereby a keystone space is formedbetween said block and arms, triangular shaped sliding blocks sliding onsaid inner surfaces of said arms beneath said ledges having parallelinner faces parallel with the major axis of the tool, clamping jawscarried on the respective parallel faces of the sliding blocks, guidingstems reciprocating in the head block carried by vthe sliding blocks,said stems being parallel with the converging faces of the arms, and amain actuating screw carried in the base block having one end adapted toactuate the screw and the other end to engage with an abutment on theshaft in which the key is located, a second screw mounted in the headblock having a hub adapted to engage with the clamping jaws t0 positionthe jaws in the sliding blocks in clamping engagement with the key, andmeans for preventing the tool 'from tipping relative to the shaft, meansbeing provided to maintain said anti-tipping means inengagement with theshaft constantly in a predetermined relationship to assist thermovementof the tool with the key relative to the shaft. j

9. In a key pulling tool, a supporting means, jaw carrying means, keyclamping jaws, said jaws and the carrying means being` so arranged thatas they move in one direction the 'faces will be maintained in parallelrelationship and will draw together to engagea key, a master actuatingmeans for moving the block and jaws with a `key relative to aI shaft,and a separate` setting means for initially setting the jaws and blocksin clamping engagement with the key, and means for preventing the toolfrom tipping relative tothe shaft, means being provided to maintain saidanti-tipping means in engagement with the shaft constantly in apredetermined relationship to assist the movement ott the tool with thekey relative to the shaft.

10. In a tool, a base block, an actuating screw having a head on one endand an actuating head on the other, means carried on the block forengaging a key, means to force said key engaging means into engagementwith the key with increasing force as the movement ot the blockprogresses, an anti tipping device consisting `of a transverse block, adepending arm, means on said main Vactuating screw to maintain thedepending arm and block in engagement with the base block despite themovement of the screw, and a second screw carried by the anti-tippingblock having `one end to actuate the screw and the other adaptedtoengage with the end of a shaft.v

11. In a key pulling tool, a base block,

an actuating screw having a head on one end and an actuating'head on theother, means carried on the block for engaging a key, lneans'to forcesaid key engaging means into engagementl with the key with increasingforce as the movement of the block progresses, an anti-tipping deviceconsisting of a transverse block, a depending arm, means on said mainactuating screw to maintain the depending arm and block in engagementwith thebase block despite rthe movement of the screw, a second screwcarried bythe anti-tipping block having one end toactuate the screw andthe other adapted to en gage with the end of a shaft, and means on saidbase block for guiding the anti-tipping block in sliding engagementtherewith. 12. In a key pulling tool, a base block, an actuating screwhaving 4a head on one end andan actuating head on the other, meansCarried on the block for engaging `a key, means to'force said keyengaging means into engagement with the key with increasing force as themovement of the blockprogresses, an anti-tipping device consisting o t'a transverse block, a depending arm, means on said main actuating screwto maintain the'depending arm and block in engagementwith the base blockdespite the movement of the screw, a second screw carried by theanti-tipping block having one end t0 actuate the screw andthe otheradapted to engage with the end of a shaft, and a third screw passingthrough said depending arm and carried by said base block having a headadapted to engage with said clamping j aws tomove them upwardly andinwardly with the sliding blocks in engagementwith the key. V, i i

`In `testimony whereof,V affix my signature. i

g MURvIN` CQ DEIFENDERFER.

